/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.bind;

import org.springframework.core.MethodParameter;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;

/**
 * Exception to be thrown when validation on an argument annotated with {@code @Valid} fails.
 *
 * @author Rossen Stoyanchev
 * @since 3.1
 */
@SuppressWarnings("serial")
public class MethodArgumentNotValidException extends Exception {

    private final MethodParameter parameter;

    private final BindingResult bindingResult;


    /**
     * Constructor for {@link MethodArgumentNotValidException}.
     *
     * @param parameter     the parameter that failed validation
     * @param bindingResult the results of the validation
     */
    public MethodArgumentNotValidException(MethodParameter parameter, BindingResult bindingResult) {
        this.parameter = parameter;
        this.bindingResult = bindingResult;
    }

    /**
     * Return the method parameter that failed validation.
     */
    public MethodParameter getParameter() {
        return this.parameter;
    }

    /**
     * Return the results of the failed validation.
     */
    public BindingResult getBindingResult() {
        return this.bindingResult;
    }


    @Override
    public String getMessage() {
        StringBuilder sb = new StringBuilder("Validation failed for argument [")
                .append(this.parameter.getParameterIndex()).append("] in ")
                .append(this.parameter.getExecutable().toGenericString());
        if (this.bindingResult.getErrorCount() > 1) {
            sb.append(" with ").append(this.bindingResult.getErrorCount()).append(" errors");
        }
        sb.append(": ");
        for (ObjectError error : this.bindingResult.getAllErrors()) {
            sb.append("[").append(error).append("] ");
        }
        return sb.toString();
    }

}
